Abstract
Delamination resistance governs the damage mode in interlayer hybrid composites. The interlaminar critical energy release rates (CERR) GIc and GIIc are for the first time reported for the different interfaces in hybrids composed of ultrahigh-modulus, low-elongation (LE) carbon fibre layers and high-strength, high-elongation (HE) carbon fibre layers in an epoxy matrix. The GIc and GIIc values at the LE/LE interface were several times lower than for the HE/HE. The GIc of the LE/HE interface was0 close to that of the HE/HE interface, whereas its GIIc was significantly higher than the average of those of the LE/LE and HE/HE interfaces, and 1.5 times higher than LE/LE value. This synergy should be taken into account for the design of LE/HE carbon fibre UD hybrids featuring stable pseudo-ductile behaviour.
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